package com.situ.day7.cal;

public abstract class Cal2 {
    private int num1;
    private int num2;

    public int add() {
        return num1 + num2;
    }

    public int sub() {
        return num1 - num2;
    }

    public int mul() {
        return num1 * num2;
    }

    public abstract void show();

}
